forked from mirrors/linux
f0d3302073
kvmalloc() doesn't support allocations > INT_MAX, but vmalloc() does - the limit should be lifted, but we can work around this for now. A user with a 75 TB filesystem reported the following journal replay error: https://github.com/koverstreet/bcachefs/issues/769 In journal replay we have to sort and dedup all the keys from the journal, which means we need a large contiguous allocation. Given that the user has 128GB of ram, the 2GB limit on allocation size has become far too small. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
38 lines
934 B
C
38 lines
934 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "darray.h"
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int __bch2_darray_resize_noprof(darray_char *d, size_t element_size, size_t new_size, gfp_t gfp)
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{
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if (new_size > d->size) {
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new_size = roundup_pow_of_two(new_size);
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/*
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* This is a workaround: kvmalloc() doesn't support > INT_MAX
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* allocations, but vmalloc() does.
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* The limit needs to be lifted from kvmalloc, and when it does
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* we'll go back to just using that.
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*/
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size_t bytes;
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if (unlikely(check_mul_overflow(new_size, element_size, &bytes)))
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return -ENOMEM;
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void *data = likely(bytes < INT_MAX)
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? kvmalloc_noprof(bytes, gfp)
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: vmalloc_noprof(bytes);
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if (!data)
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return -ENOMEM;
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if (d->size)
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memcpy(data, d->data, d->size * element_size);
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if (d->data != d->preallocated)
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kvfree(d->data);
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d->data = data;
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d->size = new_size;
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}
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return 0;
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}
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